Ruby

Add `todo` type #3921

Job	Run time
windows (windows-2019, ucrt)	1m 7s
test (master-nightly-focal, test)	2m 47s
windows (windows-2019, mswin)	1m 20s
test (master-nightly-focal, stdlib_test)	2m 55s
test (master-nightly-focal, rubocop validate test_doc build test_generate_stdlib)	2m 36s
windows (windows-2022, ucrt)	1m 20s
test (master-nightly-focal, lexer confirm_lexer)	4m 25s
windows (windows-2022, mswin)	1m 24s
test (master-nightly-focal, lexer compile)	5m 7s
test (3.2-dev-focal, test)	2m 58s
test (3.2-dev-focal, stdlib_test)	2m 42s
test (3.2-dev-focal, rubocop validate test_doc build test_generate_stdlib)	2m 25s
test (3.2-dev-focal, lexer confirm_lexer)	4m 5s
test (3.2-dev-focal, lexer compile)	4m 37s
test (3.1-dev-focal, test)	2m 52s
test (3.1-dev-focal, rubocop validate test_doc build test_generate_stdlib)	2m 56s
test (3.1-dev-focal, lexer confirm_lexer)	4m 12s
test (3.1-dev-focal, lexer compile)	5m 23s
test (3.0-dev-focal, test)	2m 30s
test (3.0-dev-focal, rubocop validate test_doc build test_generate_stdlib)	2m 52s
test (3.0-dev-focal, lexer confirm_lexer)	4m 2s
test (3.0-dev-focal, lexer compile)	4m 11s
	1h 8m 46s

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